Update README.md

Author: VectorZhao

README.md

@@ -21,7 +21,7 @@ We provide two machine learning models for uses: **Model A** trained on `[M, R,
 Download [`Anaconda`](https://www.anaconda.com/products/individual#Downloads) and install it on your machine.
 Create a `conda` environment called `Rocky_Exoplanets` and install all the necessary dependencies:
 
-    $ conda create -n Rocky_Exoplanets pip python=3.7.6 keras-mdn-layer jupyter
+    $ conda create -n Rocky_Exoplanets pip python=3.7.6 jupyter
 
 ### Step 3:
 Activate the `Rocky_Exoplanets` environment: